Comput Methods Programs Biomed - Automated detection of endotracheal tubes in paediatric chest radiographs.

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Resumo

The aim of this study was to develop an automated method for the detection of endotracheal tube and location of its tip in paediatric chest radiographs. In this method, a seed point was first determined from the line crossing the cervical region and a line path was traced from the seed point. Two features, Lmax and C, were determined from the path and were combined to detect the existence of the endotracheal tube. Multiple thresholds applied to the line path were used to determine the candidate locations for the tip, and the most suitable location was selected from these candidates by analysing the image features. To evaluate the performance of detection of endotracheal tube existence, support vector machine was used to classify the images with and without endotracheal tubes on the basis of Lmax and C. The discriminant performance of the method was evaluated using receiver operating characteristic (ROC) analysis. To evaluate the precision of the detected tip locations, the tip locations in paediatric chest images were annotated by a radiologist. The distance (error) between the detected and annotated locations was used to evaluate detection precision for the tip location. The proposed method was evaluated using 528 images with endotracheal tubes and 816 images without endotracheal tubes. The discriminant performance in this study, evaluated as Az (area under the ROC curve), for detecting the existence of endotracheal tubes on the basis of the two features was 0.943?0.009, and the detection error of the tip location was 1.89?2.01mm. The proposed method obtained high performance results and could be useful for detecting the malposition of endotracheal tubes in paediatric chest radiographs.

Resumo Limpo

aim studi develop autom method detect endotrach tube locat tip paediatr chest radiograph method seed point first determin line cross cervic region line path trace seed point two featur lmax c determin path combin detect exist endotrach tube multipl threshold appli line path use determin candid locat tip suitabl locat select candid analys imag featur evalu perform detect endotrach tube exist support vector machin use classifi imag without endotrach tube basi lmax c discrimin perform method evalu use receiv oper characterist roc analysi evalu precis detect tip locat tip locat paediatr chest imag annot radiologist distanc error detect annot locat use evalu detect precis tip locat propos method evalu use imag endotrach tube imag without endotrach tube discrimin perform studi evalu az area roc curv detect exist endotrach tube basi two featur detect error tip locat mm propos method obtain high perform result use detect malposit endotrach tube paediatr chest radiograph

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